a small town outside columbus, ohio, now a crime scene. at least four women dead. abc's alex perez is there tonight with the families now demanding answers. >> reporter: it's a mystery that has the small town of chillicothe, ohio, on edge. is there a killer on the loose, preying on women? >> our girls need justice. we need justice. >> reporter: these women united in grief, some convinced their loved ones are victims of a single killer. >> it's very tragic. very, very tragic, that all these families are going through this. >> reporter: in the last year, at least six women have disappeared from this town of about 21,000. four of their bodies recovered in creeks or streams. the circumstances all slightly different, but their stories similar. all women who had fallen on hard times. the body of 26-year-old tiffany sayre was discovered on father's day. >> she was a very beautiful girl. strong. friendly. she would help anybody out. >> reporter: the fbi now stepping in, working with local and state investigators, hunting for any clues that might lead to the killer. >> the